MASHRABOVNA, N. M. Principles of Expressing Politeness in Formal Letters . American Journal of Language, Literacy and Learning in STEM Education (2993-2769), [S. l.], v. 1, n. 6, p. 217–221, 2023. Disponível em: http://grnjournal.us/index.php/STEM/article/view/628. Acesso em: 22 dec. 2024.